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#1
spesseh

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Hi.
I am looking for good global coverage road and forest datasets.
The Roads should be high quality, and include not only primary roads. Does this exists? Ive seen Vmap0 road data. Anything more detailed?

I am also looking for global forest coverage dataset. Preferabily continous raster dataset. Anyone?

I am using ArcGis 9.3 for information.
I have been searching the net, without finding anything with a global coverage that is supported by ArcGis.

Thanks very much in advance!

Andreas
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#2
Hans van der Maarel

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I am looking for good global coverage road and forest datasets.
The Roads should be high quality, and include not only primary roads. Does this exists? Ive seen Vmap0 road data. Anything more detailed?

I am also looking for global forest coverage dataset. Preferabily continous raster dataset. Anyone?

I am using ArcGis 9.3 for information.
I have been searching the net, without finding anything with a global coverage that is supported by ArcGis.


There certainly is more detailed road information available, but it comes at a price :) If VMAP doesn't cut it for you, I think your next best bet is the commercial data vendors such as Navtec or TeleAtlas (on account of them offering global coverage in a single data model)

The AGI dataset that Nat mentioned in this post does have a global land cover raster, I just placed my order for the DVD, will let you know what I think of it as soon as I get it.
Hans van der Maarel - Cartotalk Editor
Red Geographics
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#3
Giasen

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I am looking for good global coverage road and forest datasets.
The Roads should be high quality, and include not only primary roads. Does this exists? Ive seen Vmap0 road data. Anything more detailed?

I am also looking for global forest coverage dataset. Preferabily continous raster dataset. Anyone?

I am using ArcGis 9.3 for information.
I have been searching the net, without finding anything with a global coverage that is supported by ArcGis.


There certainly is more detailed road information available, but it comes at a price :) If VMAP doesn't cut it for you, I think your next best bet is the commercial data vendors such as Navtec or TeleAtlas (on account of them offering global coverage in a single data model)

The AGI dataset that Nat mentioned in this post does have a global land cover raster, I just placed my order for the DVD, will let you know what I think of it as soon as I get it.


Have you tried Mapdex? http://www.mapdex.or...a...yr&type=lyr
GPS

#4
Michael Schmeling

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Perhaps the Gobal Land Cover Facility web site can help with the forest data:
GLCF
Michael Schmeling
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#5
spesseh

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Cheers! I will test those suggestions.

I have downloaded the:
Continuous Fields Tree Cover, Global
1992-04-01 to 1993-04-01
GLCF
Lat/Long
Global

This global file comes in .img format, and should after my knowledge be supported in ArcGis. Anyway i cant open it neither in ArcGis or Qgis. Is this some different .img format which have to be prepared for use in ArcGis?
Andreas

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#6
spesseh

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A question to Hans. You are mentioning NavTec and TeleAtlas as sources for road data. In my work i mainly work with countries in the "south", and by that need good datas for Africa, Asia, S-America. Does these data provide improved details over Vmap on these areas?
Andreas

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#7
Hans van der Maarel

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A question to Hans. You are mentioning NavTec and TeleAtlas as sources for road data. In my work i mainly work with countries in the "south", and by that need good datas for Africa, Asia, S-America. Does these data provide improved details over Vmap on these areas?


I have no experience with commercial data in those areas, so best would be to contact the vendors directly. It does seem to differ by country/region. Google Maps tends to use these datasets too, though augmented with other data, so you can sort of use it to get an idea of the coverage.

In any case, I know for certain Navtec has a "global" dataset as well as a "street level" set. It's developed for use in countries where they don't have street level data and shows the major connections. I would expect this to be of somewhat higher detail/quality than VMAP, but only a real comparison can tell.
Hans van der Maarel - Cartotalk Editor
Red Geographics
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#8
Michael Schmeling

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This global file comes in .img format, and should after my knowledge be supported in ArcGis. Anyway i cant open it neither in ArcGis or Qgis. Is this some different .img format which have to be prepared for use in ArcGis?


I don't have ArcGis, so I can't help you here. All the data I ever downloaded from GLCF was in GeoTiff format.

The VMAP0 road data is quite old and incomplete even for Europe. I would be surprised if it was better for regions in Africa or Asia.
Michael Schmeling
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#9
spesseh

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Ok. Thank you for your help.
I found some really good datasets for forest and other interesting datasets which uses GLCF data here: http://wdc.nbii.gov/ma/datapage.htm

They are in ArcGis readable format as well.

Regarding the road data i will see what to do. The idea is to summarize the road density within vector grid cells (fishnet) on a global scale.
We are creating a geostatistical dataset containing various socio-economic as well as ecological and geological data for each cell, so road density would be a good indicator on connectedness or rurality.
Andreas

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#10
Michael Schmeling

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Regarding the road data i will see what to do. The idea is to summarize the road density within vector grid cells (fishnet) on a global scale.
We are creating a geostatistical dataset containing various socio-economic as well as ecological and geological data for each cell, so road density would be a good indicator on connectedness or rurality.


How large are those cells? If they are large enough it may not be so important if a few roads are missing for calculating a statistical value only.
Michael Schmeling
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#11
spesseh

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Thats what i am thinking as well, but that requires that the quality of the density is equal everywhere, and not that some countries are missing lots of smaller roads.
The cells in our dataset are 0.5x0.5 decimal degree, and covers all terrestial areas.
Andreas

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#12
Michael Schmeling

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Thats what i am thinking as well, but that requires that the quality of the density is equal everywhere, and not that some countries are missing lots of smaller roads.
The cells in our dataset are 0.5x0.5 decimal degree, and covers all terrestial areas.


Well, then check VMAP0, perhaps it is sufficient for you.
Michael Schmeling
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#13
erynis1

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Regarding the road data i will see what to do. The idea is to summarize the road density within vector grid cells (fishnet) on a global scale.
We are creating a geostatistical dataset containing various socio-economic as well as ecological and geological data for each cell, so road density would be a good indicator on connectedness or rurality.



Hi Spesseh,

I'm currently looking for a global 0.5 degree gridded dataset of road network density, preferably in .ascii format. I've downloaded the VMAP0 dataset but I'm not very familiar with this data format, and I'm fairly new to the whole subject really, so I'm encountering a number of problems.

Basically I was wondering if you managed to succeed in creating a summarized version of the VMAP0 data that represents the information as road density per grid cell? If there's any way I might be able to obtain a copy of this dataset then I'd be extremely grateful. I've searched quite a lot on the internet and have yet to find a global gridded dataset of this type.

Hope to hear from you soon. Regards,

erynis1




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